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Photosynthetic response of salt-tolerant and sensitive soybean varieties

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Photosynthetica

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Abstract

The physiological response of two soybean varieties to salt stress was examined. The results showed that salt stress induced a significantly (p<0.01) lower decrease of the net photosynthetic rate (P N) in salt-tolerant S111-9 than in salt-sensitive Glycine max. P N decrease was positively related to the decrease of stomatal conductance (g s) and intercellular CO2 concentration (C i) in S111-9, while with g s in G. max. a threshold of relative water content (RWC) was found, above which a slight decrease in RWC lead to a sharp reduction in g s. The photochemical quenching (qP), the efficiency of open PSII centers (ΦPSII) and the Rubisco activity (RA) significantly decreased with increasing salinity level in G. max. The maximum PSII quantum yield (Fv/Fm) decreased significantly under the highest NaCl in both varieties. The higher reduction of RA in G. max was attributed to Rubisco content, which was mainly regulated at LSU expression level rather than at rbcL transcript level. These findings led us to conclude that the salt-induced reduction in P N was mainly due g s and RA for S111-9 and G. max, respective

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Abbreviations

Chl:

chlorophyll

C i :

intercellular CO2 concentration

ETR:

electron transport rate

Fo :

initial chlorophyll fluorescence

Fm :

maximal chlorophyll fluorescence

Fm′:

maximal chlorophyll fluorescence under light

Fv :

variable fluorescence

Fv′:

variable fluorescence under light

Fv/Fm :

maximum PSII quantum yield

Fv′/Fm′:

the quantum yield of open PSII centers under irradiation

g s :

stomatal conductance

LSU:

large subunit of Rubisco

PFD:

photon flux density

P N :

net photosynthetic rate

PSII:

photosystem II

qP :

photochemical quenching

RA:

Rubisco activity

RWC:

relative water content

ΦPSII :

efficiency of open PSII centers

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Authors and Affiliations

  1. State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, 310029, Hangzhou, China

    K. X. Lu, B. H. Cao, X. P. Feng, Y. He & D. A. Jiang

  2. Faculty of Life Science and Biotechnology, Ningbo University, 315211, Ningbo, China

    K. X. Lu

Authors
  1. K. X. Lu
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  2. B. H. Cao
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  3. X. P. Feng
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  4. Y. He
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  5. D. A. Jiang
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Corresponding author

Correspondence to D. A. Jiang.

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Acknowledgments: This work was partly supported by the National Natural Science Foundation (30771302, 30471051), Natural Science Foundation of Zhejiang Province (Y306213) and National High-Tech R & D Program ‘863’ (20087AA10Z191) for providing support. We also acknowledge Prof. S.J. Zhen for his critical reading of the manuscript and the useful suggestion.

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Lu, K.X., Cao, B.H., Feng, X.P. et al. Photosynthetic response of salt-tolerant and sensitive soybean varieties. Photosynthetica 47, 381–387 (2009). https://doi.org/10.1007/s11099-009-0059-7

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  • DOI: https://doi.org/10.1007/s11099-009-0059-7

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